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adjustment arrow axis backsight bearing boundary bubble calculated centre line chain line chainage chord clamp clinometer co-ordinates column contours correct cross sections curve cutting distance draw Dumpy level embankment equal error feet field book figure fixed formation level formation width gives ground Gunter's chain hairs Hence home and abroad hypotenusal inch included angles instrument justment length line of collimation link chain main scale mark mean measured method move multiply object glass obtained offset perpendicular plate screws plotted plumb-bob position Post free protractor radius ranging rod reading reduced level rise rule shown in fig side slopes Simpson's rule spirit level square staff staff-holder standard direction station subtract suppose survey surveyor tacheometer taken tangential angle tape telescope theodolite trapezoidal rule traverse triangle unclamp usually vernier x Factor zero